package com.zdy.reflection;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;

/**
 * Created by 逸足天涯
 * on 3/5/2020.
 */
public class Test10 {
    //普通方式调用
    public static void test01(){
        User user = new User();
        long startTime  = System.currentTimeMillis();
        for (int i = 0; i < 100000000 ; i++) {
            user.getName();
        }
        long endTime  = System.currentTimeMillis();
        System.out.println("反射执行10亿次：" + (endTime-startTime)+"ms");
    }
    public static void test02() throws NoSuchMethodException,IllegalAccessException, InvocationTargetException {
        User user = new User();

        //使用反射
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);

        long startTime  = System.currentTimeMillis();
        for (int i = 0; i < 100000000 ; i++) {
            getName.invoke(user, null);
        }
        long endTime  = System.currentTimeMillis();
        System.out.println("执行反射10亿次：" + (endTime-startTime)+"ms");
    }
    public static void test03() throws NoSuchMethodException,IllegalAccessException, InvocationTargetException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName", null);
        getName.setAccessible(true);
        long startTime  = System.currentTimeMillis();
        for (int i = 0; i < 100000000 ; i++) {
            getName.invoke(user, null);
        }
        long endTime  = System.currentTimeMillis();
        System.out.println("执行反射关闭检测10亿次：" + (endTime-startTime)+"ms");
    }

    public static void main(String[] args) throws NoSuchMethodException,IllegalAccessException, InvocationTargetException{
        test01();
        test02();
        test03();
    }
}
